globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005418
Scopus记录号: 2-s2.0-84991457604
论文题名:
The age of iron and iron source attribution in the ocean
作者: Holzer M; , Frants M; , Pasquier B
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期:10
起始页码: 1454
结束页码: 1474
语种: 英语
英文关键词: GEOTRACES ; Green function methods ; iron age spectrum ; iron source attribution ; marine iron cycle ; mean iron age
Scopus关键词: biogeochemical cycle ; deep water ventilation ; eolian process ; euphotic zone ; Green function ; iron ; Iron Age ; marine sediment ; nonlinearity ; numerical model ; scavenging (chemistry) ; Antarctica ; Southern Ocean
英文摘要: We use tracers to partition dissolved iron (dFe) into the contributions from each source within a numerical model of the iron cycle without perturbing the system. These contributions are further partitioned according to the time since injection into the ocean, which defines their iron-age spectrum and mean iron age. The utility of these diagnostics is illustrated for a family of inverse model estimates of the iron cycle, constrained by a data-assimilated circulation and available dFe measurements. The source contributions are compared with source anomalies defined as the differences between solutions with and without the source in question. We find that in the Southern Ocean euphotic zone, the hydrothermal and sediment contributions range from 15% to 30% of the total each, which the anomalies underestimate by a factor of ∼2 because of the nonlinearity of scavenging. The iron age is only reset by scavenging and attains a mean of several hundred years in the Southern Ocean euphotic zone, revealing that aeolian iron there is supplied primarily from depth as regenerated dFe. Tagging iron according to source region and pathways shows that 70–80% of the aeolian dFe in the euphotic zone near Antarctica is supplied from north of 46°S via paths that reach below 1 km depth. Hydrothermal iron has the oldest surface mean ages on the order of middepth ventilation times. A measure of uncertainty is provided by the systematic variations of our diagnostics across the family of iron cycle estimates, each member of which has a different aeolian source strength. ©2016. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77804
Appears in Collections:气候变化事实与影响

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作者单位: Department of Applied Mathematics, School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia; Also at Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; Department of Oceanography, Graduate School of Engineering and Applied Sciences, Naval Postgraduate School, Monterey, Canada

Recommended Citation:
Holzer M,, Frants M,, Pasquier B. The age of iron and iron source attribution in the ocean[J]. Global Biogeochemical Cycles,2016-01-01,30(10)
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